At the end, after the last word, to show that the sentence was a statement.
You put a period at the end of the sentence to indicate that the sentence has ended.
At the end of this sentence we had to put a period.
you put a period after an interrogative sentence
No. You put only one period.
Yes, you would still put a period at the end of the sentence, even if it ends with an acronym. This helps to indicate the end of the sentence clearly.
No, you do not put an extra period after "etc." since the period at the end of "etc." serves as the ending punctuation for the sentence.
So you puR period after a website link if at end of sentence
The antediluvian period.
You do not.
Yes you do.
no matter what you usually have to put a period after an apostrophe because it's the end of a sentence.
Yes, it is common to put a period after "Mrs." as it is an abbreviation for "missus."